A 56K modem that uses the V.90 standard:
a. never has problems with noise on the telephone line
b. can recognize an 8-bit digital symbol 8000 times per second
c. transmits 56,000 different symbol changes per second at all times
d. can be used at full capacity on all North American telephone lines
e. currently has 56K transmission rates in both upstream and downstream channels
Answer: can recognize a 8-bit digital symbol 8000 times per second
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Telecom Chapter 3
- _________ is one way that data rates over traditional telephone lines can be increased dramatically.
- Digital Subscriber Line:
- Inverse multiplexing means:
- Statistical time division multiplexers differ from time division multiplexers because they:
- Which of the following types of multiplexing is least efficient for data transmission?
- _____ separate channels to reduce interference between channels in frequency division multiplexing.
- Frequency division multiplexing:
- The type of multiplexer that divides the circuit horizontally into different light frequencies that are transmitted simultaneously across many channels is
- A(n) ___________ divides one high-speed communication circuit into several lower speed circuits for the primary reason of saving communication line costs.
- When converting analog voice data to digital signals, Pulse Code Modulation samples the incoming voice signal _______ times per second.
- __________ refers to the difference between the original analog data and the approximation of that data using the techniques for translating from analog data to digital signals.
- Codec refers to:
- When V.34 modems initially connect, they must go through a ____________ sequence to test the circuit and determine the optimum combination of symbol rate and modulation technique that will produce the highest throughput.
- _____ is a modem standard that uses Lempel-Ziv encoding to compress data.
- Which statement is false about modems?
- The acronym, Modem, stands for _________________.
- Using TCM that sends 6 bits per each signal and a voice grade line with a bandwidth of 3000 Hz (assume: no noise on the line), the data capacity would be ___________ bits per second.
- Which of the following statements is true?
- To get more "bandwidth" in a digital transmission, you must:
- ________ is the approximate bandwidth of traditional telephone circuits.
- The typical range of human hearing is:
- The _____________ of a circuit determines a circuit's capacity.
- ______ is a unit of signaling speed that indicates how often the signal changes on a communication circuit.
- TCM stands for: